Telephone switching system with selection of local or trunk lines



L. J. DE'NEY ET AL TELEPHoNE swr'rcHING SYSTEM WITH SELECTION March 3.1, 1953 OF' LOCAL OR TRUNK LINES Filed April 5, 194e 25 Sheets-Sheet l ...Soma mz: o8

...50:9 M2308 m25 OOM Eo'a A |NvENToRs 3 Y L.Jom DENneY n A 'novum G. DUHAMEL ,2 m Y RALPH WILLIAM ENGSBERG 57 ATTORNEY March 3l, 1953 LIDENNEY ET AL 2,633,497

TELEPHONE swITcHING SYSTEM WITH SELECTION 0F LOCAL. 0R TRUNK LINES Filed April 5; 1948 :essheets-sheet :s

To Plas 2 5a.

PART OF` FIG. 8. m5-

` To IFIG. 9.

Snventors L. Joan DENNEY ,Homan s. oummeL ,BB RALPH WILLIAM ENBSDERG Gnome!! March 31, 1953 L J DENNEY ET AL 2,633,497

TELEPHONE SWIT'CHING SYSTEM WITH SELECTION OF' LOCAL OR TRUNK LINES Fled April 5. 1948 '23 Sheets-Sheet 4 E77 EL? Zmventors ll... JOHN DENNEY man s. ommen. RALPH wlLum awesome March 3l, 1953 L. J. DENNEY ETAL v 2,633,497 TELEPHONE SWITCHING SYSTEM WITH SELECTION oF LOCAL 0R TRUNK LINES Filed April 5, 1948 25 Sheets-Sheet 5 TO. FIG. 4G.

:inventors L. JOHN DENIY Homme. ommen. RALPH WILLIAM Eneseens FIG. 3c.A

Gttomeg AMarch 31, 1953V L J. DENNEY ETA.. 2,633,497

TELEPHONE SWITCHING SYSTEM WITHSELECTION OF' LOCAL OR TRUNK LINES v Flled Aprll 5. 1948 25 Sheets-Sheet 6 nventor:

l L. .16m DENNEY .Humano e. DUHAMEL au 7M RALPH- WILLIAM E'Nessens 7 Gttorneg March 31, 1953 L. J. DENNEY ETAL 2,633,497

TELEPHONE SWITCHING SYSTEM WITH SELECTION oF LOCAL 0R TRUNK LINES. K f Filed April 5, 1948 23 Sheets-Sheet 7 KMARO G. lll-IML RALPH WILLIAM EWSBERG March 3l, 1953 1 J. DENNEY ET AL 2,633,497

TELEPHONE swITcHING SYSTEM WITH SELECTION 0F LOCAL OR TRUNK LINES 23' Sheets-Sheet 8 Filed April 5, 1948 HOWARD G. DUHAMEL RALPH WILLIAM ENGSBERG March 31, 1953 J. DENNEY ET AL 2,633,497 TELEPHONE SWITCHING SYSTEM WITH SELECTION I oF LocAL 0R TRUNK LINES Filed April 5, 194e 2 3 Sheets-Sheet 9 Zmventor: L. JOHN DENNEY HOWARD G. DUHAMEL RALPH WILLlAM ENGSBERG March 31, 19.53 L J. DENNEY ET AL 2,633,497

TELEPHONE SV'JITCHING SYSTEM 'WITH 'SELECTION OF LOCAL OR TRUNK LINES y F'lled Aprll 5, 1948 23 Sheets-Sheet 10 Snventors L. JOHN DENNEY vHOWARD G. DUHAMEL 3l! RALPH WILLIAM ENGSBERG March 3l, 1953 NEY ETAL 2,633,497

J. DEN L TELEPHONE`SWITCHING SYSTEM WITH SELECTION 0F LOCAL 0R TRUNK LINES Filed April 5. 1948 23 Sheets-Sheet ll I To fle. a.

nventors L. KIN [ENNEY 'I'KNIARD G. RIMMEL RALPH VILLIMI ENGSBG March 31, 1953 J. DENNEY ET AL 2,633,497

TELEPHONE swTTcHING SYSTEM WITH SELECTION oF LOCAL 0R TRUNK LINES Filed April 5. 1948 25 sheets-sheet 12 FIG. 2.

To FIG. 7a.

To FIG. 7c.

9 l0 Il Snuentors L. JOHN DENNEY l HowARn G. DUHAMEL RALPHL vnLum Erqasne March'31, 1953 J. DENNEY ETAL 2,633,497

TELEPHONE SWITCHING-SYSTEM WITH SELECTION OF LOCAL OR TRUNK LINES Filed April 5. 1948 23 SheeS-SheetlS FIG. 6o.

T FIG.S l

:inventors L. JOHN DENNEY -HowARo e. DUHAMEL s.. RALPH vnLum aussen@ March 31, 1953 L. J. DENNEY ET AL 2,633,497

TELEPHONE SWITCHING SYSTEM WITH SELECTION OF LOCAL OR TRUNK LINES Filed April 5, 1948 25 Sheets-Sheet 14 FIG. 6b.

` Sfmentors L JOHN DENNEY HOWARD G. DUHAMEL RALPHl WILLIAM E'NGSBERG 7 attorney March 31, 1953 l.. J. DENNl-:Y ETAL 2,533,497

TELEPHONE SWITCHING SYSTEM WITH SELECTION 0F LOCAL 0R TRUNK LINES Flled Aprll 5, 1948 l 25 Sheets-Sheet l5 FIG. 6c.

FIG. 2.

T0 FIG. 8.

nventors JOHN DENNEY HowAnn s. DUHAMEL au RALPH `WILLIAM ENcsaERG March 3l, 1953 Filed April 5, 1948 L To Flg. 3b, 6a, 6c.

FIG 7o. L

L. J. DENNEY ET AL 2,633,497 TELEPHONE SWITCHING SYSTEM WITH SELECTION oF LOCAL 0R TRUNK LINES 25 sheets-sheet 1e nventors Y L. JOHN DENNE March 3l, 1953 L J DENNEY T AL 2,633,497

TELEPHONE SWITCHING SYSTEM WITH SELECTION OFVLOCAL OR TRUNK LINES Fil-ed April 5, 1948 "23` Sheets-Sheet 17 nventora L. JOHN DENNEY HowARD s. DUHAMEL a RALPH WILLIAM. ENGSBERG .March 31, 1953 J. DENNl-:Y ET AL 2,633,497

TELEPHONE SWITCHING SYSTEMVWITH- SELECTION 'OF' LOCAL OR TRUNK LINES Fil'ed April 5.' 1948 25 Sheets-Sheet. 18

' L. JOHN DENNEY um ors HOWARD G. DUHAMEL 8g RALPH WILLIAM ENGSBERG Filed April 5, 194e 23 sheets-sheet 19 March 3l, 1953 J. DENNEY ET AL 2,633,497 TELEPHONE SWITCHING SYSTEM WITH SELECTION OF' LOCAL OR TRUNK LINES nventors' L. JOHN DENNEY F 6. 7d. I HOWARD G. DUHAMEL RALPH WILLIAM ENGSBERG March 31, 19.53

Filed April 5, 1948 FIG. 8.

L. J. DENNEY ET AL TELEPHONE SWITCHING SYSTEM WITH SELECTION oF LOCAL 0R TRUNK LINES 23 sheets-sheet 2o :Inventors L. JOHN DENNEY HOWARD G. DUHAMEL RALPH wlLLlAM ENGSBERG 

